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I have a D7000 and have used a SB-600 and SC-17 cord since day one. I had the SB-600 for my D70s.
One of the biggest advantages to using any flash other than the on camera is extended battery life of the camera battery.
The SB-600 is a good flash, but, having had it for 2 years, I never fully learned how to use it. The menu system is not intuitive. I could find the answer in the book, but, two months later, back to the book!!!
I purchased a SB-700 a week ago, and I now know how to use it much better than the SB-600.
The SB-700 just seems to make sense to me. Consider it
The other features of the SB-700 are also a big plus.